A more thorough explanation:

POSTERIORES

Posteriores refer to descendants in a direct line beyond the sixth degree in Roman law.

For example, if a person's great-great-great-great-great-grandchild is considered a posterior.

Another example is if a person's great-great-great-great-great-great-grandchild is considered a posterior.

The examples illustrate that posteriores are descendants who are beyond the sixth degree of a direct line. In other words, they are the great-great-great-great-great-grandchildren or beyond of a person. These descendants are not considered immediate family members and may not have the same legal rights as closer relatives.